Photovoltaic module and method for producing the same

Abstract

Embodiments of the present disclosure relates to a photovoltaic module and a method for producing the photovoltaic module. The photovoltaic module includes a photovoltaic laminate and a junction box. The photovoltaic laminate includes a plurality of solar cells, at least one solder strip, a rear plate and a wiring member. The at least one solder strip is electrically connected with the wiring member. The junction box includes a bonding pad. The wiring member passes through an opening defined on the rear plate and abuts the bonding pad, and the wiring member is connected with the bonding pad by laser welding. A plurality of weld seams are formed in a welding region. Each weld seam extends from the wiring member towards interior of the bonding pad, and an extension depth of each weld seam in the bonding pad is not greater than 80% of a thickness of the bonding pad.

What is claimed is: 
     
       1. A photovoltaic module, comprising:
 a photovoltaic laminate and a junction box; 
 wherein the photovoltaic laminate comprises a plurality of solar cells, at least one solder strip, a rear plate and a wiring member, the plurality of solar cells are electrically connected by the at least one solder strip to form at least one cell string, the at least one cell string is stacked over the rear plate, and the at least one solder strip is electrically connected with the wiring member; 
 wherein the junction box is fixed and connected to a side of the rear plate away from the plurality of solar cells, and the junction box comprises a bonding pad; 
 wherein the wiring member passes through an opening defined on the rear plate and abuts the bonding pad, and the wiring member is connected with the bonding pad by a plurality of weld seams formed by laser welding; and 
 wherein the plurality of weld seams are formed in a welding region between the wiring member and the bonding pad, the plurality of weld seams are configured to connect the wiring member and the bonding pad to form an integrated structure, wherein each of the plurality of weld seams extends from the wiring member towards an interior of the bonding pad, and an extension depth of each of the plurality of weld seams in the bonding pad is not greater than 80% of a thickness of the bonding pad. 
 
     
     
       2. The photovoltaic module according to  claim 1 , wherein the plurality of weld seams penetrate the wiring member and form a shape of straight lines, polygonal lines or curves on a surface of the wiring member away from the plurality of solar cells. 
     
     
       3. The photovoltaic module according to  claim 1 , wherein the bonding pad comprises a plurality of recesses formed on a surface of the bonding pad facing to the wiring member and in the welding region, each of the plurality of recesses surrounds a respective weld seam, and there is a gap between each of the plurality of recesses and a surface of the wiring member facing to the bonding pad. 
     
     
       4. The photovoltaic module according to  claim 1 , wherein each of the plurality of weld seams comprises a first segment formed in the wiring member and a second segment formed in the bonding pad, and the first segment and the second segment are interconnected at an interface between the wiring member and the bonding pad. 
     
     
       5. The photovoltaic module according to  claim 4 , wherein a width of the first segment is constant in a direction directing from the wiring member to the bonding pad, or the width of the first segment decreases in the direction directing from the wiring member to the bonding pad. 
     
     
       6. The photovoltaic module according to  claim 4 , wherein a width of the second segment is constant in a direction directing from the wiring member to the bonding pad, or the width of the second segment decreases in the direction directing from the wiring member to the bonding pad. 
     
     
       7. The photovoltaic module according to  claim 1 , wherein the plurality of weld seams form a shape of straight lines on a surface of the wiring member away from the plurality of solar cells, and the plurality of weld seams distribute in a width direction of the wiring member; and
 a length of each of the plurality of weld seams is not less than 3 mm and not greater than 5 mm, and a width of each of the plurality of weld seams is not less than 0.3 mm and not greater than 0.4 mm. 
 
     
     
       8. The photovoltaic module according to  claim 1 , wherein the plurality of weld seams form a shape of straight lines on a surface of the wiring member away from the plurality of solar cells, and a distance between adjacent weld seams is not less than 0.4 mm and not greater than 0.6 mm. 
     
     
       9. The photovoltaic module according to  claim 1 , wherein a region in which the wiring member abuts the bonding pad has a first area, the welding region has a second area, and the second area is 30% to 60% of the first area. 
     
     
       10. The photovoltaic module according to  claim 9 , wherein the second area is 40% to 50% of the first area. 
     
     
       11. The photovoltaic module according to  claim 1 , wherein the plurality of weld seams comprise a first weld seam and a second weld seam, the first weld seam forms a closed pattern, and the second weld seam is formed in the closed pattern formed by the first weld seam. 
     
     
       12. The photovoltaic module according to  claim 11 , wherein the first weld seam forms a shape identical to that formed by the second weld seam on a surface of the wiring member away from the plurality of solar cells. 
     
     
       13. The photovoltaic module according to  claim 11 , wherein the plurality of weld seams further comprise a third weld seam, the second weld seam forms a closed pattern, and the third weld seam is formed in the closed pattern formed by the second weld seam. 
     
     
       14. The photovoltaic module according to  claim 1 , wherein a positioning region is defined on the bonding pad, and the positioning region occupies a part of or a whole surface of the bonding pad facing to the wiring member; and
 a facing region in which the wiring member abuts the bonding pad is defined on the bonding pad, the positioning region has an area greater than an area of the facing region, and the facing region is defined within the positioning region. 
 
     
     
       15. The photovoltaic module according to  claim 14 , wherein the positioning region has two first boundaries opposite to each other in a first direction, the facing region is defined between the two first boundaries, and there is a spacing between the facing region and either one of the two first boundaries. 
     
     
       16. The photovoltaic module according to  claim 15 , wherein the positioning region has two second boundaries opposite to each other in a second direction perpendicular to the first direction, the welding region is defined between the two second boundaries, and there is a spacing between the welding region and either one of the two second boundaries. 
     
     
       17. The photovoltaic module according to  claim 1 , comprising two bonding pads and two wiring members, wherein each of the two bonding pads is connected with a respective wiring member of the photovoltaic laminate. 
     
     
       18. The photovoltaic module according to  claim 17 , wherein the junction box further comprises a diode, one end of the diode is electrically connected to one of the two bonding pads, and the other end of the diode is electrically connected to the other bonding pad. 
     
     
       19. The photovoltaic module according to  claim 18 , wherein the diode is arranged between the two bonding pads, and the diode and the two bonding pads form a shape of U.